GUARANTORS OF SECURITIES (Condensed Balance Sheet) (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Dec. 31, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Current assets: |
|
|
|
|
|
|
Cash and cash equivalents |
$ 49,612
|
[1] |
$ 50,753
|
[1] |
$ 16,553
|
$ 13,583
|
Receivables: |
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
34,732
|
|
33,306
|
|
|
|
Trade, dry-leasing |
2,446
|
|
3,803
|
|
|
|
Tax receivables |
2,843
|
|
3,187
|
|
|
|
Other |
7,204
|
|
2,343
|
|
|
|
Inventories, net |
20,893
|
|
20,673
|
|
|
|
Prepaid expenses |
2,233
|
|
1,807
|
|
|
|
Total current assets |
119,963
|
|
115,872
|
|
|
|
Property and equipment |
918,252
|
|
917,161
|
|
|
|
Accumulated depreciation |
(327,444)
|
|
(317,967)
|
|
|
|
Property and equipment, net |
590,808
|
|
599,194
|
|
|
|
Operating lease right-of-use |
8,460
|
|
|
|
|
|
Equity investments and advances |
24,427
|
|
27,112
|
|
|
|
Investments in consolidated subsidiaries |
0
|
|
0
|
|
|
|
Intangible assets |
1,102
|
|
1,107
|
|
|
|
Deferred income taxes |
0
|
|
0
|
|
|
|
Intercompany receivables |
0
|
|
0
|
|
|
|
Other assets |
21,081
|
|
21,578
|
|
|
|
Total assets |
765,841
|
|
764,863
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
Accounts payable and accrued expenses |
12,643
|
|
13,161
|
|
|
|
Accrued wages and benefits |
5,524
|
|
9,267
|
|
|
|
Accrued interest |
3,376
|
|
569
|
|
|
|
Accrued income taxes |
2,874
|
|
973
|
|
|
|
Accrued other taxes |
1,414
|
|
1,268
|
|
|
|
Accrued contingencies |
656
|
|
630
|
|
|
|
Current portion of long-term debt |
1,938
|
|
2,058
|
|
|
|
Other current liabilities |
3,092
|
|
878
|
|
|
|
Total current liabilities |
31,517
|
|
28,804
|
|
|
|
Long-term debt |
159,961
|
|
160,217
|
|
|
|
Deferred income taxes |
104,824
|
|
108,357
|
|
|
|
Intercompany payables |
0
|
|
0
|
|
|
|
Operating lease liabilities |
6,773
|
|
|
|
|
|
Other liabilities |
721
|
|
747
|
|
|
|
Total liabilities |
303,796
|
|
298,125
|
|
|
|
Redeemable noncontrolling interest |
3,160
|
|
3,302
|
|
3,603
|
3,766
|
Equity: |
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 22,220,676 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
224
|
|
219
|
|
|
|
Additional paid-in capital |
448,690
|
|
447,298
|
|
|
|
Retained earnings |
12,342
|
|
18,285
|
|
|
|
Treasury shares, at cost; 157,267 and 156,737 shares in 2019 and 2018, respectively |
(2,481)
|
|
(2,476)
|
|
|
|
Accumulated other comprehensive income, net of tax |
110
|
|
110
|
|
|
|
Total equity |
458,885
|
|
463,436
|
|
$ 445,716
|
$ 445,681
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
765,841
|
|
764,863
|
|
|
|
Reportable Legal Entities | Parent |
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
Cash and cash equivalents |
48,876
|
|
48,396
|
|
|
|
Receivables: |
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
0
|
|
0
|
|
|
|
Trade, dry-leasing |
0
|
|
0
|
|
|
|
Tax receivables |
0
|
|
0
|
|
|
|
Other |
5,000
|
|
0
|
|
|
|
Inventories, net |
0
|
|
0
|
|
|
|
Prepaid expenses |
726
|
|
398
|
|
|
|
Total current assets |
54,602
|
|
48,794
|
|
|
|
Property and equipment |
0
|
|
0
|
|
|
|
Accumulated depreciation |
0
|
|
0
|
|
|
|
Property and equipment, net |
0
|
|
0
|
|
|
|
Operating lease right-of-use |
0
|
|
|
|
|
|
Equity investments and advances |
0
|
|
0
|
|
|
|
Investments in consolidated subsidiaries |
171,671
|
|
172,950
|
|
|
|
Intangible assets |
0
|
|
0
|
|
|
|
Deferred income taxes |
11,513
|
|
9,904
|
|
|
|
Intercompany receivables |
358,653
|
|
366,541
|
|
|
|
Other assets |
1,106
|
|
1,251
|
|
|
|
Total assets |
597,545
|
|
599,440
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
Accounts payable and accrued expenses |
584
|
|
136
|
|
|
|
Accrued wages and benefits |
5
|
|
43
|
|
|
|
Accrued interest |
3,307
|
|
500
|
|
|
|
Accrued income taxes |
69
|
|
918
|
|
|
|
Accrued other taxes |
306
|
|
0
|
|
|
|
Accrued contingencies |
0
|
|
0
|
|
|
|
Current portion of long-term debt |
0
|
|
0
|
|
|
|
Other current liabilities |
469
|
|
647
|
|
|
|
Total current liabilities |
4,740
|
|
2,244
|
|
|
|
Long-term debt |
134,060
|
|
133,900
|
|
|
|
Deferred income taxes |
0
|
|
0
|
|
|
|
Intercompany payables |
0
|
|
0
|
|
|
|
Operating lease liabilities |
0
|
|
|
|
|
|
Other liabilities |
0
|
|
0
|
|
|
|
Total liabilities |
138,800
|
|
136,144
|
|
|
|
Redeemable noncontrolling interest |
0
|
|
0
|
|
|
|
Equity: |
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 22,220,676 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
224
|
|
219
|
|
|
|
Additional paid-in capital |
448,692
|
|
447,299
|
|
|
|
Retained earnings |
12,310
|
|
18,254
|
|
|
|
Treasury shares, at cost; 157,267 and 156,737 shares in 2019 and 2018, respectively |
(2,481)
|
|
(2,476)
|
|
|
|
Accumulated other comprehensive income, net of tax |
|
|
0
|
|
|
|
Total equity |
458,745
|
|
463,296
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
597,545
|
|
599,440
|
|
|
|
Reportable Legal Entities | Guarantors |
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
Cash and cash equivalents |
0
|
|
0
|
|
|
|
Receivables: |
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
24,741
|
|
27,509
|
|
|
|
Trade, dry-leasing |
2,446
|
|
3,803
|
|
|
|
Tax receivables |
6
|
|
6
|
|
|
|
Other |
1,863
|
|
1,949
|
|
|
|
Inventories, net |
20,858
|
|
20,633
|
|
|
|
Prepaid expenses |
1,292
|
|
1,219
|
|
|
|
Total current assets |
51,206
|
|
55,119
|
|
|
|
Property and equipment |
901,547
|
|
900,611
|
|
|
|
Accumulated depreciation |
(323,733)
|
|
(314,567)
|
|
|
|
Property and equipment, net |
577,814
|
|
586,044
|
|
|
|
Operating lease right-of-use |
7,317
|
|
|
|
|
|
Equity investments and advances |
24,427
|
|
27,112
|
|
|
|
Investments in consolidated subsidiaries |
0
|
|
0
|
|
|
|
Intangible assets |
0
|
|
0
|
|
|
|
Deferred income taxes |
0
|
|
0
|
|
|
|
Intercompany receivables |
0
|
|
0
|
|
|
|
Other assets |
19,873
|
|
20,231
|
|
|
|
Total assets |
680,637
|
|
688,506
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
Accounts payable and accrued expenses |
10,378
|
|
11,357
|
|
|
|
Accrued wages and benefits |
4,060
|
|
7,743
|
|
|
|
Accrued interest |
69
|
|
69
|
|
|
|
Accrued income taxes |
2,800
|
|
6
|
|
|
|
Accrued other taxes |
687
|
|
768
|
|
|
|
Accrued contingencies |
0
|
|
0
|
|
|
|
Current portion of long-term debt |
1,663
|
|
1,663
|
|
|
|
Other current liabilities |
2,167
|
|
220
|
|
|
|
Total current liabilities |
21,824
|
|
21,826
|
|
|
|
Long-term debt |
25,901
|
|
26,317
|
|
|
|
Deferred income taxes |
115,091
|
|
117,015
|
|
|
|
Intercompany payables |
298,659
|
|
310,727
|
|
|
|
Operating lease liabilities |
6,074
|
|
|
|
|
|
Other liabilities |
721
|
|
720
|
|
|
|
Total liabilities |
468,270
|
|
476,605
|
|
|
|
Redeemable noncontrolling interest |
3
|
|
3
|
|
|
|
Equity: |
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 22,220,676 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
0
|
|
0
|
|
|
|
Additional paid-in capital |
100,306
|
|
100,306
|
|
|
|
Retained earnings |
111,948
|
|
111,482
|
|
|
|
Treasury shares, at cost; 157,267 and 156,737 shares in 2019 and 2018, respectively |
0
|
|
0
|
|
|
|
Accumulated other comprehensive income, net of tax |
110
|
|
110
|
|
|
|
Total equity |
212,364
|
|
211,898
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
680,637
|
|
688,506
|
|
|
|
Reportable Legal Entities | Non-guarantors |
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
Cash and cash equivalents |
736
|
|
2,357
|
|
|
|
Receivables: |
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
9,991
|
|
5,797
|
|
|
|
Trade, dry-leasing |
0
|
|
0
|
|
|
|
Tax receivables |
2,837
|
|
3,181
|
|
|
|
Other |
341
|
|
394
|
|
|
|
Inventories, net |
35
|
|
40
|
|
|
|
Prepaid expenses |
215
|
|
190
|
|
|
|
Total current assets |
14,155
|
|
11,959
|
|
|
|
Property and equipment |
16,705
|
|
16,550
|
|
|
|
Accumulated depreciation |
(3,711)
|
|
(3,400)
|
|
|
|
Property and equipment, net |
12,994
|
|
13,150
|
|
|
|
Operating lease right-of-use |
1,143
|
|
|
|
|
|
Equity investments and advances |
0
|
|
0
|
|
|
|
Investments in consolidated subsidiaries |
0
|
|
0
|
|
|
|
Intangible assets |
1,102
|
|
1,107
|
|
|
|
Deferred income taxes |
0
|
|
0
|
|
|
|
Intercompany receivables |
0
|
|
0
|
|
|
|
Other assets |
102
|
|
96
|
|
|
|
Total assets |
29,496
|
|
26,312
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
Accounts payable and accrued expenses |
1,681
|
|
1,668
|
|
|
|
Accrued wages and benefits |
1,459
|
|
1,481
|
|
|
|
Accrued interest |
0
|
|
0
|
|
|
|
Accrued income taxes |
5
|
|
49
|
|
|
|
Accrued other taxes |
421
|
|
500
|
|
|
|
Accrued contingencies |
656
|
|
630
|
|
|
|
Current portion of long-term debt |
275
|
|
395
|
|
|
|
Other current liabilities |
456
|
|
11
|
|
|
|
Total current liabilities |
4,953
|
|
4,734
|
|
|
|
Long-term debt |
0
|
|
0
|
|
|
|
Deferred income taxes |
1,245
|
|
1,245
|
|
|
|
Intercompany payables |
60,026
|
|
55,847
|
|
|
|
Operating lease liabilities |
699
|
|
|
|
|
|
Other liabilities |
0
|
|
27
|
|
|
|
Total liabilities |
66,923
|
|
61,853
|
|
|
|
Redeemable noncontrolling interest |
3,157
|
|
3,299
|
|
|
|
Equity: |
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 22,220,676 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
0
|
|
0
|
|
|
|
Additional paid-in capital |
4,561
|
|
4,562
|
|
|
|
Retained earnings |
(45,145)
|
|
(43,402)
|
|
|
|
Treasury shares, at cost; 157,267 and 156,737 shares in 2019 and 2018, respectively |
0
|
|
0
|
|
|
|
Accumulated other comprehensive income, net of tax |
0
|
|
0
|
|
|
|
Total equity |
(40,584)
|
|
(38,840)
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
29,496
|
|
26,312
|
|
|
|
Eliminations |
|
|
|
|
|
|
Current assets: |
|
|
|
|
|
|
Cash and cash equivalents |
0
|
|
0
|
|
|
|
Receivables: |
|
|
|
|
|
|
Trade, operating, net of allowance for doubtful accounts |
0
|
|
0
|
|
|
|
Trade, dry-leasing |
0
|
|
0
|
|
|
|
Tax receivables |
0
|
|
0
|
|
|
|
Other |
0
|
|
0
|
|
|
|
Inventories, net |
0
|
|
0
|
|
|
|
Prepaid expenses |
0
|
|
0
|
|
|
|
Total current assets |
0
|
|
0
|
|
|
|
Property and equipment |
0
|
|
0
|
|
|
|
Accumulated depreciation |
0
|
|
0
|
|
|
|
Property and equipment, net |
0
|
|
0
|
|
|
|
Operating lease right-of-use |
0
|
|
|
|
|
|
Equity investments and advances |
0
|
|
0
|
|
|
|
Investments in consolidated subsidiaries |
(171,671)
|
|
(172,950)
|
|
|
|
Intangible assets |
0
|
|
0
|
|
|
|
Deferred income taxes |
(11,513)
|
|
(9,904)
|
|
|
|
Intercompany receivables |
(358,653)
|
|
(366,541)
|
|
|
|
Other assets |
0
|
|
0
|
|
|
|
Total assets |
(541,837)
|
|
(549,395)
|
|
|
|
Current liabilities: |
|
|
|
|
|
|
Accounts payable and accrued expenses |
0
|
|
0
|
|
|
|
Accrued wages and benefits |
0
|
|
0
|
|
|
|
Accrued interest |
0
|
|
0
|
|
|
|
Accrued income taxes |
0
|
|
0
|
|
|
|
Accrued other taxes |
0
|
|
0
|
|
|
|
Accrued contingencies |
0
|
|
0
|
|
|
|
Current portion of long-term debt |
0
|
|
0
|
|
|
|
Other current liabilities |
0
|
|
0
|
|
|
|
Total current liabilities |
0
|
|
0
|
|
|
|
Long-term debt |
0
|
|
0
|
|
|
|
Deferred income taxes |
(11,512)
|
|
(9,903)
|
|
|
|
Intercompany payables |
(358,685)
|
|
(366,574)
|
|
|
|
Operating lease liabilities |
0
|
|
|
|
|
|
Other liabilities |
0
|
|
0
|
|
|
|
Total liabilities |
(370,197)
|
|
(376,477)
|
|
|
|
Redeemable noncontrolling interest |
0
|
|
0
|
|
|
|
Equity: |
|
|
|
|
|
|
Common stock, $0.01 par value, 60,000,000 shares authorized; 22,220,676 and 21,765,404 outstanding in 2019 and 2018, respectively, exclusive of treasury shares |
0
|
|
0
|
|
|
|
Additional paid-in capital |
(104,869)
|
|
(104,869)
|
|
|
|
Retained earnings |
(66,771)
|
|
(68,049)
|
|
|
|
Treasury shares, at cost; 157,267 and 156,737 shares in 2019 and 2018, respectively |
0
|
|
0
|
|
|
|
Accumulated other comprehensive income, net of tax |
0
|
|
0
|
|
|
|
Total equity |
(171,640)
|
|
(172,918)
|
|
|
|
Total liabilities, redeemable noncontrolling interest and stockholders’ equity |
$ (541,837)
|
|
$ (549,395)
|
|
|
|
|
|